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On the distribution of the Peña -Rodríguez portmanteau statistic
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نویسنده
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provost s.b. ,sanjel d. ,sheng s.z.
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منبع
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pakistan journal of statistics and operation research - 2012 - دوره : 8 - شماره : 3 - صفحه:415 -432
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چکیده
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Peña and rodríguez (2002) introduced a portmanteau test for time series which turns out to be more powerful than those proposed by ljung and box (1986) and monti (1994),and approximated its distribution by means of a two-parameter gamma random variable. a polynomially adjusted beta approximation is proposed in this paper. this approximant is based on the moments of the statistic,which can be estimated by simulation or determined by symbolic computations or numerical integration. various types of time series processes such as ar (1),ma (1),arma (2,2) are being considered. the proposed approximation turns out to be nearly exact.
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کلیدواژه
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Beta approximation; Gamma approximation; Moments; Portmanteau test; Symbolic computation
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آدرس
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department of statistical and actuarial sciences,the university of western ontario,london, Canada, department of mathematics and statistics,minnesota state university,mankato, United States, department of statistical and actuarial sciences,the university of western ontario,london, Canada
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Authors
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